INGREDIENTS
1 ½ cups sugar
½ cup butter, room temperature
½ cup shortening
2 eggs
2 ¾ cups flour
2 teaspoons cream of tartar
1 teaspoon baking soda
¼ teaspoon salt
¼ cup sugar
2 teaspoons cinnamon
DIRECTIONS
Heat oven to 400ºF.
Mix 1 1/2 cups sugar, the butter, shortening and eggs in large bowl. Stir in flour, cream of tartar, baking soda and salt.
Shape dough into 1 1/4-inch balls. Mix 1/4 cup sugar and the cinnamon. Roll balls in cinnamon-sugar mixture. Place 2 inches apart on ungreased cookie sheet.
Bake 8 to 10 minutes or until set. Remove from cookie sheet to wire rack.
I got the recipe here.